American Board of Opticianry (ABO) Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What is defined as the colors that visible or white light is composed of?

Ray

All colors

The other options are incorrect because they do not accurately describe what visible or white light is composed of. Ray refers to a light beam, not colors. Refraction refers to the bending of light, not the colors of light combined. Photons are particles of electromagnetic radiation, but they are not colors themselves. Therefore, the only correct answer is choice B, all colors. Visible and white light is composed of all the colors of the visible spectrum, which are red, orange, yellow, green, blue, indigo, and violet. These colors can be seen when white light passes through a prism and is split into its individual parts, creating a rainbow.

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Refraction

Photons

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